Absolute Optical Angle Encoder

Introduction

A national research organisation is offering a technology for absolute optical angle encoder. The encoder provides absolute angle information with 0.35 degree accuracy. It operates with a grey coded disc, infrared transmitters and receivers. The output is 10 bit grey coded TTL data.The encoder data can be transmitted and displayed at a distant place with the help of a signal processor and display unit. The signal processor converts the encoder data into BCD format which can be transmitted on a Rs 232C line. The display system receives Rs 232C data, converts them into parallel lines and displays the angle on seven segment displays. The total system operates on +/- 12 V DC. The system has been developed for use in small and medium size satellite earth station antennas for providing look angle information. For an antennas, two encoders are required for mounting on two axes. Use of RS 232C line enables placing display unit away from the antenna and use of minimum number of transmission lines.

SPECIFICATIONS OPTONAL ENCODER

• Type Absolute
• Code Grey
• No. of bits 10
• Steps per revolution 1024
• Data outputs Parallel (10 lines)
• Output level TTL
• Operating voltage 12V DC +/- 10% (5v DC optional)
• Accuracy < = 1 bit/0.35 deg.
• Increment direction CW (observed from shaft side)
• Operating environment Outdoor
• Weight 2.5 kg.
• Size Radius 12 cm, Height 10 cm

PROCESSOR and DISPLAY UNIT

• Inputs Two 10 Bit TTL Inputs, Grey type
• Output RS232 C, data and clock, BCD
• Frame 20 Bits and 16 Bits with two sync characters
• Data Rate 9.6 K Bits
• Display 5 + 4.7 segment LED
• Resolution 0.01 deg.
• Supply (Processor) +/- 12 V +/- 10
• Supply (Display Unit) +/- 5V

MARKETING OF THE MANUFACTURED PRODUCT

Marketing should be done by the licensee.

Electrical, Electronics

• Primarily designed for earth station antenna angle readings.
• Can be used with small and medium size antennas and multisatellite or different satellites.
• Can be used for nay rotating axis angle measurements,such as in lathe, milling machine etc.

Simple in realisation

Provides an accuracy of 0.35 deg.
Fabricated from commercial grade components available in local market.
Encoder with 0.01 deg. accuracy is presently under development.

Inputs Required

Raw Materials:Optoelectronic devices, standard, disc., PCB, other components, connector, mechanical assembly, standard IC, SLSI, connector, mechanical box, chassis, cables and connectors

Transfer Forms

Know-how; Patent for Sale; Technical assistance

Main Application

Electrical/Electronics/Telecommunications

For further information please contact

Technology Bureau for Small Enterprises
APCTT Building, Qutub Institutional Area
P.O. Box – 4575
New Delhi – 110016, India